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Re: coolant fan switch
It's hooked up to the temperature sensor. if you don't get a temp light on, the sensor might be bad. it's usually located where the upper radiator hose goes into the engine. also check your thermostat.
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If the temp gauge shows normal, you would not expect the fan to be on much. It is controlled by the coolant temp sensor. If the fan will not come on when the car gets really hot, it is possible this sensor has failed.
It is normal for both AC and cooling fans to be on when you turn on AC to cool setting.
The coolant fan switch is the located in lower part of the radiator by the compressor, some other Camry's the put it by the other temp switch by the head, between the air box and the cylinder head. Just disconnect the sensor and the computer activate the fans, connector usually is green.
Javier, have you checked the coolant overflow tank for holes, cracks, or loose hose? When the engine in your car heats up, the coolant expands. The coolant overflow tank (located near the radiator) takes up any coolant that is forced out of the radiator. If the tank is damaged or not connected to the radiator correctly, the coolant will not siphon back into the cooling system when the engine cools off.
First are you sure the fans are good. Unplug the fans and hook directly to the battery and see if they turn. One fan is for the engine and should come on when the car gets hot. The other generally comes on when the a/c system is on. If both fans work hooked directly to the battery they are good go to the cooling fan switch or temperature switch (same thing different name) and make sure it is good. This tells the fan to kick on when the car gets hot. The other one kicks on when a switch on the a/c system tells it to kick on. Check and make sure you are getting power to the fans. Get a test light and ground it to a good ground on the car and probe the plugins going to the fans and insure there is power coming to them when the car is running. If no power fuse is bad or the sending unit is bad.
Possible stuck thermostat(located front LH side below the alternator), or faulty water pump(inside timing cover)!! The fan has no connectors because its hydraulic driver through the power steering pump(V-6 models only). You may disconnect the switch on the powersteering pump to test the fan.....with the switch unplugged rev the motor to 2200RPM and you should hear the fan increase in speed. If not check the filter (LH side of the radiator) its black with rubber tubing on each side. Check also power steering fluid. Hopefully this helps!!
Check the coolant temp sensor. Also check the coolant level. If the level is low an air pocket can develop at the temp sensor. Heated air would take much longer to trigger the bi metal swith to activate.